4256641 has 8 divisors (see below), whose sum is σ = 4467968. Its totient is φ = 4050000.

The previous prime is 4256639. The next prime is 4256653. The reversal of 4256641 is 1466524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(4256641) divides (4256641-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 4256641 - 2¹ = 4256639 is a prime.

4256641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4256671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766 + ... + 3016.

It is an arithmetic number, because the mean of its divisors is an integer number (558496).

Almost surely, 2^4256641 is an apocalyptic number.

It is an amenable number.

4256641 is a deficient number, since it is larger than the sum of its proper divisors (211327).

4256641 is a wasteful number, since it uses less digits than its factorization.

4256641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343.

The product of its digits is 5760, while the sum is 28.

The square root of 4256641 is about 2063.1628631788. The cubic root of 4256641 is about 162.0649158118.

The spelling of 4256641 in words is "four million, two hundred fifty-six thousand, six hundred forty-one".